Structure 41871 · Northumberland County, PA

SR 147 Future NB over Over Twp 589

Carries SR 147 Future NB over Over Twp 589, 0.5 Mile North Of Milton.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT74 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

74 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a box-beam bridge.

Built200224 years old
Length74.1 ft22.6 m
Daily traffic8,515counted 2023
Last inspectedDecember 2023every 48 months

Location

StatePennsylvania
CountyNorthumberland
Location0.5 Mile North Of Milton
CarriesSR 147 Future NB
CrossesOver Twp 589
Coordinates41.03144, -76.83756

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length74.1 ft (22.6 m)
Max Span73.2 ft (22.3 m)
Deck Width48.2 ft (14.7 m)
Deck Area332.2 sq m
Main Spans1
Year Built2002

Traffic

Avg Daily Traffic8,515 (2023)
Truck Traffic24%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionDecember 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000041871

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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